P2249 Fault Code

O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2249 code indicates a problem with the oxygen (O2) sensor reference voltage circuit in Bank 2, specifically for Sensor 1. This is a crucial component of the vehicle's emission control system, which monitors the level of oxygen in the exhaust gases to optimize fuel efficiency and reduce emissions. A low reference voltage can lead to inaccurate readings from the O2 sensor, impacting engine performance.

What are the symptoms of the P2249 code?

Common symptoms associated with the P2249 fault code include:

• Illuminated check engine light on the dashboard.
• Poor fuel efficiency due to improper air-fuel mixture.
• Rough idling or stalling of the engine.
• Increased emissions, which can lead to failing state emissions tests.

What causes the P2249 code?

Several issues can lead to the P2249 code being triggered:

• A malfunctioning O2 sensor that cannot correctly communicate its readings.
• Damaged or frayed wiring in the reference voltage circuit that may cause a short circuit or an open circuit.
• Corrosion or poor connections at the O2 sensor connector.
• Failure of the engine control module (ECM) to send the correct reference voltage.

How to fix P2249?

To resolve the P2249 code, consider the following steps:

• Inspect the O2 sensor and its wiring for any visible damage or corrosion.
• Use a multimeter to check the reference voltage from the ECM and verify continuity in the circuit.
• Replace the O2 sensor if it is found to be faulty.
• Repair or replace any damaged wiring or connectors associated with the O2 sensor.
• Clear the fault code from the ECM and perform a test drive to ensure the issue is resolved.